28444224 has 28 divisors (see below), whose sum is σ = 75259184. Its totient is φ = 9481344.

The previous prime is 28444223. The next prime is 28444243. The reversal of 28444224 is 42244482.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 28444191 and 28444200.

It is not an unprimeable number, because it can be changed into a prime (28444223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73882 + ... + 74265.

It is an arithmetic number, because the mean of its divisors is an integer number (2687828).

Almost surely, 2^28444224 is an apocalyptic number.

28444224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28444224 is an abundant number, since it is smaller than the sum of its proper divisors (46814960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28444224 is a wasteful number, since it uses less digits than its factorization.

28444224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148162 (or 148152 counting only the distinct ones).

The product of its digits is 16384, while the sum is 30.

The square root of 28444224 is about 5333.3126666266. The cubic root of 28444224 is about 305.2563427646.

The spelling of 28444224 in words is "twenty-eight million, four hundred forty-four thousand, two hundred twenty-four".